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Need to calibrate a 1999 sterling odometer

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by greaseburner, Aug 17, 2018.

Page 1 of 3
  1. Aug 17, 2018 #1
    greaseburner

    greaseburner Light Load Member

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    As the post says. anyone know what each little switch means?

    Our old odometer quit working, so we got one from a junk truck and it's way off.

    Any help most welcome.

    Thank you
     
    greaseburner, Aug 17, 2018
    greaseburner, Aug 17, 2018
    #1
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  3. Aug 17, 2018 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Maybe just set the switches the same as the old one?
     
    BoxCarKidd, Aug 17, 2018
    BoxCarKidd, Aug 17, 2018
    #2
    AModelCat Thanks this.
  4. Aug 17, 2018 #3
    greaseburner

    greaseburner Light Load Member

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    Great idea. never thought of that. Duh!

    With that said, anyone know what he switch represents? I am thinking of changing rear ends in that truck. Thanks
     
    greaseburner, Aug 17, 2018
    greaseburner, Aug 17, 2018
    #3
  5. Aug 17, 2018 #4
    AModelCat

    AModelCat Road Train Member

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    IIRC there is a mathmatical formula specific to the speedometer that you need to fill in with info specific to your truck (tire size, number of teeth on tone ring, gear ratio etc). Once you have the equation solved then you set the switches according to the closest number in the speedometer manufacturer's manual.
     
    AModelCat, Aug 17, 2018
    AModelCat, Aug 17, 2018
    #4
  7. Aug 17, 2018 #5
    AModelCat

    AModelCat Road Train Member

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    AModelCat, Aug 17, 2018
    AModelCat, Aug 17, 2018
    #5
  8. Aug 17, 2018 #6
    greaseburner

    greaseburner Light Load Member

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    Yes, anyone got that manual? We bought a digital odometer for one of the KW's a month back. It had a little code paper with it, but even it wasn't 100% accurate based on the info it requested and what we supplied. We had to change it some based on a gps unit.

    Thanks
     
    greaseburner, Aug 17, 2018
    greaseburner, Aug 17, 2018
    #6
  9. Aug 17, 2018 #7
    greaseburner

    greaseburner Light Load Member

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    Ok, thanks. But are all settings the same for each ? I haven't looked at mine yet, but what way is closed and which is open?
     
    greaseburner, Aug 17, 2018
    greaseburner, Aug 17, 2018
    #7
  10. Aug 17, 2018 #8
    GrapeApe

    GrapeApe Road Train Member

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    First off, 1999 could go either way. You either have a dual VSS or a single. If there's 4 wires on your VSS, one is for the speedo and the other is the ECM. If that's the case, then just google speedo dip switch settings you'll find the formula for the dip switch settings.

    If you only have 1 plug on the VSS, then that is for the engine ECM and the speedo pulls speed from the engine. In that case, the dip switch settings stay the same and you'll need to adjust the pules per mile in the engine ECM to correct the speedo for any gear ratio/tire size change.
     
    GrapeApe, Aug 17, 2018
    GrapeApe, Aug 17, 2018
    #8
    BoxCarKidd and swaan Thank this.
  11. Aug 17, 2018 #9
    greaseburner

    greaseburner Light Load Member

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    I'm assuming the VSS he is where the plug is very close to the dip settings. If that's the case, there's a total of 10 wires. 5 on each side. There is a small space though between the 2 sets of wires though.
     
    Last edited: Aug 17, 2018
    greaseburner, Aug 17, 2018
    greaseburner, Aug 17, 2018
    #9
  12. Aug 17, 2018 #10
    greaseburner

    greaseburner Light Load Member

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    I tried posting a picture, but as per the norm the file won't upload even though I take the picture with the icon here on this forum.
     
    greaseburner, Aug 17, 2018
    greaseburner, Aug 17, 2018
    #10
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